Machining technology for internal gear of precision planetary reducer with small tooth difference
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A planetary reducer and processing technology, applied in the direction of belts/chains/gears, gear teeth, components with teeth, etc., can solve the problem of no research results reported on internal gears, reduce the cost of the whole machine, and improve the surface hardness , The effect of reducing the number of parts
Active Publication Date: 2017-06-13
CHONGQING UNIV +1
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At present, the internal gear of the general cycloidal precision planetary reducer has a soft tooth surface, and the hardness of the bearing support part of the output mechanism is generally low. However, due to the high economical machining accuracy of the internal gear, the problem of the internal gear of the precision planetary reducer with small tooth difference has not
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[0030] Example 1,
[0031] 1) Forging: The selected material is low-carbon high-quality alloy steel, and the blank is forged by die forging;
[0032] 2) Isothermal normalizing, the hardness of isothermal normalizing is HB160-190;
[0033] 3) Rough turning: The outer circle of the rough turning blank is flat, the left and right end faces are flat, and the process allowance is 0.5mm to ensure the processing size; the outer circle is the positioning reference, the inner hole of the rough turning and the inner hole of the bearing raceway are controlled to be the same between each inner hole Axial degree and perpendicularity to the end face;
[0034] 4) Gear shaper: Take the bearing raceway 5 as the benchmark, and use a special slotting tool to process the internal gear arc containment groove 7, leaving a margin of 0.5mm;
[0035] 5) Heat treatment: Carburize and quench the raceways 1, 5 and the arc containment groove 7 of the internal gear, the carburized layer depth is 1-1.2mm, the surfac...
Example Embodiment
[0042] Example 2,
[0043] 1) Forging: The material is selected as high-strength medium carbon steel, and the blank is forged by die forging;
[0044] 2) Isothermal normalizing, the hardness of isothermal normalizing is HB160-190;
[0045] 3) Rough turning: The outer circle of the rough turning blank is flat, the left and right end faces are flat, and the process allowance is 0.5mm to ensure the processing size; the outer circle is the positioning reference, the inner hole of the rough turning and the inner hole of the bearing raceway are controlled to be the same between each inner hole Axial degree and perpendicularity to the end face;
[0046] 4) Gear shaper: Take the raceway 5 as the benchmark, and use a special slotting tool to process the internal gear arc containing groove 7 with a margin of 0.5mm;
[0047] 5) Heat treatment: local high frequency quenching treatment for raceways 1, 5 and internal gear arc containment groove 7;
[0048] 6) Rough grinding: Roughly grind the right e...
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Abstract
The invention discloses a machining technology for an internal gear of a precision planetary reducer with the small tooth difference. The internal gear integrates the prominent features of an internal gear which is provided with a supporting bearing outer raceway and an arc containing groove as the hard tooth surface. The machining technology includes the steps that A, material selection is performed, and a blank is forged; B heat treatment is conducted; C, rough turning of an outer circle and an end face is carried out, and the outer circle is used as the datum to machine an inner hole and a bearing raceway; D, the arc containing groove is subjected to gear shaping machining; E, the raceway and the arc containing grove are subjected to quench hardening treatment; F, an inner circle, the outer circle and the end face are coarsely ground, and the bearing raceway is used as the datum to coarsely grind the arc containing groove; G, heat treatment is conducted again; H, the outer circle and the end face are accurately ground; and I, the bearing raceway and the arc containing groove are also accurately ground. By the adoption of the machining technology, the bearing raceway and the arc containing groove are machined using the same datum, so that machining precision is guaranteed, installation errors are reduced, and the high-precision requirement of the reducer is met; and due to the fact that the bearing raceway and the arc containing grove are subjected to quench hardening treatment, precision retaining ability and carrying capacity of the precision reducer are improved.
Description
technical field [0001] The invention belongs to the technical field of mechanical processing, and relates to a processing technology for an internal gear of a precision planetary reducer with less tooth difference. Background technique [0002] The precision planetary reducer with small tooth difference has the outstanding advantages of high transmission precision, large transmission ratio, compact structure, large load capacity and high transmission efficiency, and is widely used in industrial fields such as robotics, mining, metallurgy, chemical industry, textiles, and national defense industry. As a precision reducer, the transmission error and the accuracy retention of the whole machine are important indicators to measure the precision reducer. The internal gear is one of the key components of this type of reducer. First, it forms the key meshing pair of the precision reducer together with the needle roller and cycloid gear. Second, it supports the output mechanism. In ...
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